The comovement between monetary and fiscal policy instruments during the post-war period in the U.S.

摘要

This paper empirically studies the dynamic relationship between monetary and fiscal policies by analyzing the comovements between the Fed funds rate and the primary deficit/output ratio. Simple economic thinking establishes that a negative correlation between Fed rate and deficit arises whenever the two policy authorities share a common stabilization objective. However, when budget balancing concerns lead to a drastic deficit reduction the Fed may reduce the Fed rate in order to smooth the impact of fiscal policy, which results in a positive correlation between these two policy instruments. The empirical results show (ⅰ) a significant negative comovement between Fed rate and deficit and (ⅱ) that deficit and output gap Granger-cause the Fed funds rate during the post-Volcker era, but the opposite is not true.